Login Register Sign up for the GRM e-newsletter

Login to post Forums » Grassroots Motorsports » COmputer Controlled Car - Help!
  • pinchvalve

    March 19, 2010 11:12 p.m. pinchvalve UberDork

    OK, so I have been working on a friends 96 Ford Contour, and I thought I had it done. I replaced the head gasket and fixed major cooling problems. It ran fine for a while, but now has developed an issue. Normally, I would double-check the timing and idle speed, but everything is controlled by the computer so I am out luck. Perhaps someone can interpret the odd problem it has developed.

    The car starts fine, idles fine, revs up in park just fine. Shift into reverse, and I can back up a steep driveway just fine. Even zoom out if I want. But as soon as I shift into drive, it dies. If I give it some extra gas and feather it a bit, it will go forward, but as soon as I put the pedal down, it hesitates. The motor intermittently cuts out completely, like the fuel is being cut. If I let off the gas, then SLOWLY apply the gas and build up speed, it will run fine. I can get it up to highway speed with no missing or hesitation at all. But if I lift off, then give it power like on a hill, it will sputter again.

    No codes on the OBDII. New plugs and wires. Removed and checked the fuel pump. Replaced the fuel filter. Nothing wrong in the air intake. Nothing mechanical that I can find at all. My advice is take it to a dealer and hook it up to their fancy computer and see if it says anything.

  • Streetwiseguy

    March 19, 2010 11:21 p.m. Streetwiseguy Reader

    Go find the split in the air intake boot that opens up when the engine moves, or figure out which wire harness is unplugging itself.

    Timing? Base idle? Why would you worry about such things?

  • Hal

    March 20, 2010 9:01 a.m. Hal HalfDork

    Does that car have a DPFE sensor? That sounds like what happens on a Focus when the DPFE sensor goes bad.

    Also check the connections on the Throttle Position Sensor(TPS) and the Mass Air Flow Sensor (MAF). Find someone who has a scanner that can give you real time readings on those two sensors.

  • pinchvalve

    March 29, 2010 8:51 a.m. pinchvalve UberDork

    So the car was taken to a local shop, and they diagnosed a bad mass air flow sensor. It was replaced, and it ran well for a day or two, then started acting up again. Now, they are saying that it is the transmission and it needs replaced at a cost of $2K. Ugh.

    I don't buy that a new transmission will make the engine run better. I mean, it shifts fine, no lurching or slipping. It even runs fine in reverse. It seems like something in the transmission is talking to the motor and that link is messed up. Bad sensor? Bad wire? Bad connection? Bad sender? Is there such a thing on a car?

 

You'll need to log in to post.